// Modifications by Stephen M. Redd
//      - Corrected IE8 close preview window bug (IE8 tried to close hosting window when using iframe preview)
//      - Added killPreview function to support an explicit close preview button in the toolbar
//      - Added previewOpen option to allow editor to be created with preview already opened
//      - Added options for attaching a callback function to the open/close preview operation
//      - Added options and code to support side-by-side preview mode



// ----------------------------------------------------------------------------
// markItUp! Universal MarkUp Engine, JQuery plugin
// v 1.1.5
// Dual licensed under the MIT and GPL licenses.
// ----------------------------------------------------------------------------
// Copyright (C) 2007-2008 Jay Salvat
// http://markitup.jaysalvat.com/
// ----------------------------------------------------------------------------
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
// ----------------------------------------------------------------------------
(function ($) {
	$.fn.markItUp = function (settings, extraSettings) {
		var options, ctrlKey, shiftKey, altKey;
		ctrlKey = shiftKey = altKey = false;

		options = { id: '',
			nameSpace: '',
			root: '',
			previewInWindow: '', // 'width=800, height=600, resizable=yes, scrollbars=yes'
			previewAutoRefresh: true,
			previewPosition: 'after',
			previewTemplatePath: '~/templates/preview.html',
			previewParserPath: '',
			previewParserVar: 'data',
			resizeHandle: true,
			beforeInsert: '',
			afterInsert: '',
			onEnter: {},
			onShiftEnter: {},
			onCtrlEnter: {},
			onTab: {},
			previewOpen: false,
			previewOpenCallback: null,
			previewCloseCallback: null,
			sideBySidePreviewMode: true,
			markupSet: [{ /* set */
		}]
	};
	$.extend(options, settings, extraSettings);

	// compute markItUp! path
	if (!options.root) {
		$('script').each(function (a, tag) {
			miuScript = $(tag).get(0).src.match(/(.*)jquery\.markitup(\.pack)?\.js$/);
			if (miuScript !== null) {
				options.root = miuScript[1];
			}
		});
	}

	return this.each(function () {
		var $$, textarea, levels, scrollPosition, caretPosition, caretOffset,
				clicked, hash, header, footer, previewWindow, template, iFrame, abort, idn, markItUpPreviewContainer
		$$ = $(this);
		textarea = this;
		levels = [];
		abort = false;
		scrollPosition = caretPosition = 0;
		caretOffset = -1;

		options.previewParserPath = localize(options.previewParserPath);
		options.previewTemplatePath = localize(options.previewTemplatePath);

		// apply the computed path to ~/
		function localize(data, inText) {
			if (inText) {
				return data.replace(/("|')~\//g, "$1" + options.root);
			}
			return data.replace(/^~\//, options.root);
		}

		// init and build editor
		function init() {
			idn = ''; id = ''; nameSpace = '';
			if (options.id) {
				idn = options.id;
			} else if ($$.attr("id")) {
				idn = 'markItUp' + ($$.attr("id").substr(0, 1).toUpperCase()) + ($$.attr("id").substr(1));

			}

			id = 'id="' + idn + '"';
			if (options.nameSpace) {
				nameSpace = 'class="' + options.nameSpace + ' markItUpWrapper"';
			}
			else {
				nameSpace = 'class="markItUpWrapper"';
			}


			$$.wrap('<div ' + nameSpace + '></div>');
			$$.wrap('<div ' + id + ' class="markItUp"></div>');
			$$.wrap('<div class="markItUpContainer"></div>');
			$$.addClass("markItUpEditor");


			// add the header before the textarea
			header = $('<div class="markItUpHeader"></div>').insertBefore($$);
			if (options.sideBySidePreviewMode) {
				markItUpPreviewContainer = $('<div id="' + idn + '_markItUpPreviewContainer" class="markItUpPreviewContainer"></div>').insertBefore($("#" + idn));
				markItUpPreviewContainer.hide();
			}
			$(dropMenus(options.markupSet)).appendTo(header);

			// add the footer after the textarea
			footer = $('<div class="markItUpFooter"></div>').insertAfter($$);

			// add the resize handle after textarea
			if (options.resizeHandle === true && $.browser.safari !== true) {
				resizeHandle = $('<div class="markItUpResizeHandle"></div>')
						.insertAfter($$)
						.bind("mousedown", function (e) {
							var h = $$.height(), y = e.clientY, mouseMove, mouseUp;
							mouseMove = function (e) {
								$$.css("height", Math.max(20, e.clientY + h - y) + "px");
								return false;
							};
							mouseUp = function (e) {
								$("html").unbind("mousemove", mouseMove).unbind("mouseup", mouseUp);
								return false;
							};
							$("html").bind("mousemove", mouseMove).bind("mouseup", mouseUp);
						});
				footer.append(resizeHandle);
			}

			// listen key events
			$$.keydown(keyPressed).keyup(keyPressed);

			// bind an event to catch external calls
			$$.bind("insertion", function (e, settings) {
				if (settings.target !== false) {
					get();
				}
				if (textarea === $.markItUp.focused) {
					markup(settings);
				}
			});

			// remember the last focus
			$$.focus(function () {
				$.markItUp.focused = this;
			});
			if (options.previewOpen) {
				preview();
				refreshPreview();
			}
		}

		// recursively build header with dropMenus from markupset
		function dropMenus(markupSet) {
			var ul = $('<ul></ul>'), i = 0;
			$('li:hover > ul', ul).css('display', 'block');
			$.each(markupSet, function () {
				var button = this, t = '', title, li, j;
				title = (button.key) ? (button.name || '') + ' [Ctrl+' + button.key + ']' : (button.name || '');
				key = (button.key) ? 'accesskey="' + button.key + '"' : '';
				if (button.separator) {
					li = $('<li class="markItUpSeparator">' + (button.separator || '') + '</li>').appendTo(ul);
				} else {
					i++;
					for (j = levels.length - 1; j >= 0; j--) {
						t += levels[j] + "-";
					}
					li = $('<li class="markItUpButton markItUpButton' + t + (i) + ' ' + (button.className || '') + '"><a href="" ' + key + ' title="' + title + '">' + (button.name || '') + '</a></li>')
						.bind("contextmenu", function () { // prevent contextmenu on mac and allow ctrl+click
							return false;
						}).click(function () {
							return false;
						}).mouseup(function () {
							if (button.call) {
								eval(button.call)();
							}
							markup(button);
							return false;
						}).hover(function () {
							$('> ul', this).show();
							$(document).one('click', function () { // close dropmenu if click outside
								$('ul ul', header).hide();
							}
								);
						}, function () {
							$('> ul', this).hide();
						}
						).appendTo(ul);
					if (button.dropMenu) {
						levels.push(i);
						$(li).addClass('markItUpDropMenu').append(dropMenus(button.dropMenu));
					}
				}
			});
			levels.pop();
			return ul;
		}

		// markItUp! markups
		function magicMarkups(string) {
			if (string) {
				string = string.toString();
				string = string.replace(/\(\!\(([\s\S]*?)\)\!\)/g,
						function (x, a) {
							var b = a.split('|!|');
							if (altKey === true) {
								return (b[1] !== undefined) ? b[1] : b[0];
							} else {
								return (b[1] === undefined) ? "" : b[0];
							}
						}
					);
				// [![prompt]!], [![prompt:!:value]!]
				string = string.replace(/\[\!\[([\s\S]*?)\]\!\]/g,
						function (x, a) {
							var b = a.split(':!:');
							if (abort === true) {
								return false;
							}
							value = prompt(b[0], (b[1]) ? b[1] : '');
							if (value === null) {
								abort = true;
							}
							return value;
						}
					);
				return string;
			}
			return "";
		}

		// prepare action
		function prepare(action) {
			if ($.isFunction(action)) {
				action = action(hash);
			}
			return magicMarkups(action);
		}

		// build block to insert
		function build(string) {
			openWith = prepare(clicked.openWith);
			placeHolder = prepare(clicked.placeHolder);
			replaceWith = prepare(clicked.replaceWith);
			closeWith = prepare(clicked.closeWith);
			if (replaceWith !== "") {
				block = openWith + replaceWith + closeWith;
			} else if (selection === '' && placeHolder !== '') {
				block = openWith + placeHolder + closeWith;
			} else {
				block = openWith + (string || selection) + closeWith;
			}
			return { block: block,
				openWith: openWith,
				replaceWith: replaceWith,
				placeHolder: placeHolder,
				closeWith: closeWith
			};
		}

		// define markup to insert
		function markup(button) {
			var len, j, n, i;
			hash = clicked = button;
			get();

			$.extend(hash, { line: "",
				root: options.root,
				textarea: textarea,
				selection: (selection || ''),
				caretPosition: caretPosition,
				ctrlKey: ctrlKey,
				shiftKey: shiftKey,
				altKey: altKey
			}
							);
			// callbacks before insertion
			prepare(options.beforeInsert);
			prepare(clicked.beforeInsert);
			if (ctrlKey === true && shiftKey === true) {
				prepare(clicked.beforeMultiInsert);
			}
			$.extend(hash, { line: 1 });

			if (ctrlKey === true && shiftKey === true) {
				lines = selection.split(/\r?\n/);
				for (j = 0, n = lines.length, i = 0; i < n; i++) {
					if ($.trim(lines[i]) !== '') {
						$.extend(hash, { line: ++j, selection: lines[i] });
						lines[i] = build(lines[i]).block;
					} else {
						lines[i] = "";
					}
				}
				string = { block: lines.join('\n') };
				start = caretPosition;
				len = string.block.length + (($.browser.opera) ? n : 0);
			} else if (ctrlKey === true) {
				string = build(selection);
				start = caretPosition + string.openWith.length;
				len = string.block.length - string.openWith.length - string.closeWith.length;
				len -= fixIeBug(string.block);
			} else if (shiftKey === true) {
				string = build(selection);
				start = caretPosition;
				len = string.block.length;
				len -= fixIeBug(string.block);
			} else {
				string = build(selection);
				start = caretPosition + string.block.length;
				len = 0;
				start -= fixIeBug(string.block);
			}
			if ((selection === '' && string.replaceWith === '')) {
				caretOffset += fixOperaBug(string.block);

				start = caretPosition + string.openWith.length;
				len = string.block.length - string.openWith.length - string.closeWith.length;

				caretOffset = $$.val().substring(caretPosition, $$.val().length).length;
				caretOffset -= fixOperaBug($$.val().substring(0, caretPosition));
			}
			$.extend(hash, { caretPosition: caretPosition, scrollPosition: scrollPosition });

			if (string.block !== selection && abort === false) {
				insert(string.block);
				set(start, len);
			} else {
				caretOffset = -1;
			}
			get();

			$.extend(hash, { line: '', selection: selection });

			// callbacks after insertion
			if (ctrlKey === true && shiftKey === true) {
				prepare(clicked.afterMultiInsert);
			}
			prepare(clicked.afterInsert);
			prepare(options.afterInsert);

			// refresh preview if opened
			if (previewWindow && options.previewAutoRefresh) {
				refreshPreview();
			}

			// reinit keyevent
			shiftKey = altKey = ctrlKey = abort = false;
		}

		// Substract linefeed in Opera
		function fixOperaBug(string) {
			if ($.browser.opera) {
				return string.length - string.replace(/\n*/g, '').length;
			}
			return 0;
		}
		// Substract linefeed in IE
		function fixIeBug(string) {
			if ($.browser.msie) {
				return string.length - string.replace(/\r*/g, '').length;
			}
			return 0;
		}

		// add markup
		function insert(block) {
			if (document.selection) {
				var newSelection = document.selection.createRange();
				newSelection.text = block;
			} else {
				$$.val($$.val().substring(0, caretPosition) + block + $$.val().substring(caretPosition + selection.length, $$.val().length));
			}
		}

		// set a selection
		function set(start, len) {
			if (textarea.createTextRange) {
				// quick fix to make it work on Opera 9.5
				if ($.browser.opera && $.browser.version >= 9.5 && len == 0) {
					return false;
				}
				range = textarea.createTextRange();
				range.collapse(true);
				range.moveStart('character', start);
				range.moveEnd('character', len);
				range.select();
			} else if (textarea.setSelectionRange) {
				textarea.setSelectionRange(start, start + len);
			}
			textarea.scrollTop = scrollPosition;
			textarea.focus();
		}

		// get the selection
		function get() {
			textarea.focus();

			scrollPosition = textarea.scrollTop;
			if (document.selection) {
				selection = document.selection.createRange().text;
				if ($.browser.msie) { // ie
					var range = document.selection.createRange(), rangeCopy = range.duplicate();
					rangeCopy.moveToElementText(textarea);
					caretPosition = -1;
					while (rangeCopy.inRange(range)) { // fix most of the ie bugs with linefeeds...
						rangeCopy.moveStart('character');
						caretPosition++;
					}
				} else { // opera
					caretPosition = textarea.selectionStart;
				}
			} else { // gecko
				caretPosition = textarea.selectionStart;
				selection = $$.val().substring(caretPosition, textarea.selectionEnd);
			}
			return selection;
		}




		// open preview window
		function preview() {
			if (!previewWindow || previewWindow.closed) {
				if (options.previewInWindow) {
					previewWindow = window.open('', 'preview', options.previewInWindow);
				} else {
					iFrame = $('<iframe class="markItUpPreviewFrame"></iframe>');

					if (markItUpPreviewContainer) {
						markItUpPreviewContainer.show();
						iFrame.appendTo(markItUpPreviewContainer);
					}
					else {

						if (options.previewPosition == 'after') {
							iFrame.insertAfter(footer);
						} else {
							iFrame.insertBefore(header);
						}
					}
					previewWindow = iFrame[iFrame.length - 1].contentWindow || iFrame[iFrame.length - 1];
				}
				if (options.previewOpenCallback != null) {
					options.previewOpenCallback();
				}
			} else if (altKey === true) {

				if (iFrame) {
					iFrame.remove();
					if (markItUpPreviewContainer) { markItUpPreviewContainer.hide(); }
				}
				else {
					previewWindow.close();
				}

				previewWindow = iFrame = false;
				if (options.previewCloseCallback != null) {
					options.previewCloseCallback();
				}
			}
			if (!options.previewAutoRefresh) {
				refreshPreview();
			}

		}

		function killPreview() {
			if (iFrame) {
				iFrame.remove();
			} else {
				previewWindow.close();
			}
			previewWindow = iFrame = false;
			if (options.previewCloseCallback != null) {
				options.previewCloseCallback();
			}

			if (markItUpPreviewContainer) { markItUpPreviewContainer.hide(); }


		}

		// refresh Preview window
		function refreshPreview() {
			if (previewWindow.document) {
				try {
					sp = previewWindow.document.documentElement.scrollTop
				} catch (e) {
					sp = 0;
				}
				previewWindow.document.open();
				previewWindow.document.write(renderPreview());
				previewWindow.document.close();
				previewWindow.document.documentElement.scrollTop = sp;
			}
			if (options.previewInWindow) {
				previewWindow.focus();
			}
		}

		function renderPreview() {
			if (options.previewParserPath !== '') {
				$.ajax({
					type: 'POST',
					async: false,
					url: options.previewParserPath,
					data: options.previewParserVar + '=' + encodeURIComponent($$.val()),
					success: function (data) {
						phtml = localize(data, 1);
					}
				});
			} else {
				if (!template) {
					$.ajax({
						async: false,
						url: options.previewTemplatePath,
						success: function (data) {
							template = localize(data, 1);
						}
					});
				}
				phtml = template.replace(/<!-- content -->/g, $$.val());
			}
			return phtml;
		}

		// set keys pressed
		function keyPressed(e) {
			shiftKey = e.shiftKey;
			altKey = e.altKey;
			ctrlKey = (!(e.altKey && e.ctrlKey)) ? e.ctrlKey : false;

			if (e.type === 'keydown') {
				if (ctrlKey === true) {
					li = $("a[accesskey=" + String.fromCharCode(e.keyCode) + "]", header).parent('li');
					if (li.length !== 0) {
						ctrlKey = false;
						li.triggerHandler('mouseup');
						return false;
					}
				}
				if (e.keyCode === 13 || e.keyCode === 10) { // Enter key
					if (ctrlKey === true) {  // Enter + Ctrl
						ctrlKey = false;
						markup(options.onCtrlEnter);
						return options.onCtrlEnter.keepDefault;
					} else if (shiftKey === true) { // Enter + Shift
						shiftKey = false;
						markup(options.onShiftEnter);
						return options.onShiftEnter.keepDefault;
					} else { // only Enter
						markup(options.onEnter);
						return options.onEnter.keepDefault;
					}
				}
				if (e.keyCode === 9) { // Tab key
					if (shiftKey == true || ctrlKey == true || altKey == true) { // Thx Dr Floob.
						return false;
					}
					if (caretOffset !== -1) {
						get();
						caretOffset = $$.val().length - caretOffset;
						set(caretOffset, 0);
						caretOffset = -1;
						return false;
					} else {
						markup(options.onTab);
						return options.onTab.keepDefault;
					}
				}
			}
		}

		init();
	});
};

$.fn.markItUpRemove = function () {
	return this.each(function () {
		$$ = $(this).unbind().removeClass('markItUpEditor');
		$$.parent('div').parent('div.markItUp').parent('div').replaceWith($$);
	}
		);
};

$.markItUp = function (settings) {
	var options = { target: false };
	$.extend(options, settings);
	if (options.target) {
		return $(options.target).each(function () {
			$(this).focus();
			$(this).trigger('insertion', [options]);
		});
	} else {
		$('textarea').trigger('insertion', [options]);
	}
};
})(jQuery);
